JP7442370B2 - composite slab structure - Google Patents

Description

The present invention relates to composite slab structures.

As a conventional synthetic slab structure, the one described in Patent Document 1 is known. This composite slab structure includes a deck plate and concrete placed above the deck plate. Additionally, composite slab structures have steps provided by varying the thickness of the concrete.

Japanese Patent Application Publication No. 2000-144996

Here, if a step is provided by changing the thickness of the concrete, the thickness of the concrete at the upper level of the slab becomes thicker than necessary, resulting in a problem that the weight of the composite slab structure increases. On the other hand, in Patent Document 1, an increase in weight is avoided by burying void material or the like in areas where the concrete is thick. However, such a method has problems in that it requires too much time and effort in construction, and accuracy control is difficult. Another method of creating a step in a composite slab structure is to install a beam between the ends of the upper deck plate and the lower deck plate, place the upper deck plate on the top of the beam, and place the lower deck plate on the beam. One method is to place it on a bracket on the side of the wood. However, this method has the problem that a beam must be added to provide the step, and the structure around the beam becomes complicated.

The present invention was made to solve such problems, and an object of the present invention is to provide a synthetic slab structure in which a step can be provided without complicating the structure.

The synthetic slab structure according to the present invention is a synthetic slab structure with steps, and includes an upper deck plate arranged on the upper side of the slab and having a plurality of grooves extending in the span direction, and an upper deck plate arranged on the lower side of the slab and having a plurality of grooves extending in the span direction. A lower deck plate having a plurality of grooves extending into the slab, and concrete constituting the upper slab and the lower slab, the upper deck plate and the lower deck plate are arranged in the span direction, and the lower deck plate is , a first stress transmission member is disposed below the upper deck plate and is provided in the concrete to transmit stress between the upper slab and the lower slab, and the first stress transmission member is arranged below the upper deck plate. It includes a first portion extending in the span direction within the groove of the plate, and a second portion extending toward the lower side of the slab than the end of the upper deck plate and disposed above the lower deck plate.

In the composite slab structure according to the present invention, the lower deck plate on the lower side of the slab is arranged below the upper deck plate on the upper side of the slab. According to such a configuration, unlike a configuration in which a step is created by pouring concrete so that the thickness of the upper level of the slab is thicker than the thickness of the upper level of the slab, the thickness of the upper level of the slab and the thickness of the lower level of the slab are different from the straight deck plate. The difference in thickness can be eliminated or reduced. Therefore, an increase in weight due to excessively increasing the thickness of the upper slab can be suppressed. Here, a first stress transmission member is provided in the concrete to transmit stress between the upper slab and the lower slab. The first stress transmitting member includes a first portion extending in the span direction within the groove of the upper deck plate, and a second portion extending toward the lower side of the slab than the end of the upper deck plate and disposed above the lower deck plate. 2 parts. Since the first portion is disposed within the groove of the upper deck plate, by adhering to the concrete, it is possible to sufficiently receive the stress acting on the upper deck plate. The second portion extends to the lower side of the slab and is located above the lower deck plate. Therefore, the first stress transmitting member can effectively transmit stress to each other between the first portion and the second portion. From the above, even if the upper deck plate and the lower deck plate are separated without being connected via a beam or the like, stress can be transmitted well through the first stress transmitting member. I can do it. In addition, since the first stress transmission member only needs to be a member of a predetermined shape placed in the concrete, the structure can be made simpler than when stress is transmitted using beams or the like. It is possible to reduce the construction effort. As described above, a step can be provided without complicating the structure.

The concrete has an upper surface, a lower surface, and a step surface between the upper surface and the lower surface, and the step surface is located at a position spaced from the end of the upper deck plate toward the lower side of the slab, The second portion of the first stress transmission member extends to the lower level side of the slab than the stepped surface. In this case, the first stress transmission member is inserted deep into the concrete above the lower deck plate. Thereby, it is possible to improve the adhesion of the first stress transmission member to the concrete above the lower deck plate.

A second stress transmitting member may be provided within the concrete and extending spanwise within the groove of the lower deck plate. Since the second stress transmitting member is disposed within the groove of the lower deck plate, by adhering to the concrete, it is possible to sufficiently receive the stress acting on the lower deck plate. The second stress transmitting member can easily transmit stress via the concrete to the second portion of the first stress transmitting member located above. Thereby, stress can be favorably transmitted between the upper deck plate and the lower deck plate via the first stress transmitting member and the second stress transmitting member.

A reinforcing member extending in the vertical direction may be provided in the concrete at the boundary between the upper deck plate and the lower deck plate. In this case, the reinforcing member can restrain the concrete in the vertical direction at the boundary between the upper deck plate and the lower deck plate. Therefore, the reinforcing member can suppress cracks in the concrete near the first stress transmitting member that develop from the end of the upper deck plate. Thereby, it is possible to suppress a decrease in the adhesion force between the first stress transmission member and concrete, and to ensure the stress transmission performance of the stress transmission member.

The reinforcing member may extend to a position higher than at least the upper deck plate. In this case, the reinforcing member can sufficiently restrain the concrete.

At least one stress transmission member may be arranged in each of the plurality of grooves of the upper deck plate and the lower deck plate. Thereby, stress can be transmitted well at each position in the width direction of the upper deck plate and the lower deck plate.

According to the present invention, it is an object of the present invention to provide a composite slab structure in which a step can be provided without complicating the structure.

1 is a cross-sectional view of a composite slab structure according to an embodiment of the invention. FIG. It is a sectional view of a deck plate. FIG. 3 is an enlarged cross-sectional view showing the structure near the step of the composite slab structure. FIG. 7 is an enlarged cross-sectional view of a composite slab structure according to a modified example. FIG. 7 is an enlarged cross-sectional view of a composite slab structure according to a modified example. It is a sectional view showing another example of a deck plate.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view of a composite slab structure 100 according to an embodiment of the invention. As shown in FIG. 1, the composite slab structure 100 is provided with a step 15 on the upper surface side. The composite slab structure 100 includes an upper deck plate 10A, a lower deck plate 10B, and concrete 12.

First, with reference to FIG. 2, the configuration of the deck plates 10A and 10B will be described. FIG. 2 is a sectional view of the deck plates 10A and 10B. Note that although a stress transmission member 20, which will be described later, is also shown in FIG. 2, the concrete 12 is omitted. As shown in FIG. 2, the connecting portion 10a at one end of the deck plates 10A, 10B in the width direction D2 and the connecting portion 10b at the other end have cross-sectional shapes that can be connected to each other when they are laid out side by side. The deck plate 10 has two peaks 10c and a groove 10d between them. Note that the number of peaks 10c is not particularly limited. The mountain portion 10c has key portions 10f that can be connected to the concrete 12 on inclined portions 10e on both sides of the mountain portion 10c. Further, the groove portion 10d has a rib 10g that can be combined with the concrete 12. Note that the direction in which the groove portions 10d extend is referred to as a span direction D1, and the direction in which the groove portions 10d are lined up is referred to as a width direction D2. In the composite slab structure 100, a plurality of deck plates 10A and 10B are provided so as to be connected to each other and arranged in the width direction D2.

Returning to FIG. 1, the upper deck plate 10A and the lower deck plate 10B are arranged in the span direction D1. In the following description, in the span direction D1, the side where the upper deck plate 10A is provided is referred to as the "slab upper side", and the side where the lower deck plate 10B is provided is referred to as the "slab lower side". Sometimes referred to as The lower slab end 10n of the upper deck plate 10A in the span direction D1 and the upper slab end 10h of the lower deck plate 10B in the span direction D1 are arranged at substantially the same position in the span direction D1. Further, the lower deck plate 10B is arranged below the upper deck plate 10A. Note that the positional relationship in the span direction D1 between the end 10n of the upper deck plate 10A and the end 10h of the lower deck plate 10B is not particularly limited, and for example, they may be arranged apart from each other in the span direction D1.

Therefore, the end 10n of the upper deck plate 10A and the end 10h of the lower deck plate 10B are vertically shifted from each other. In this embodiment, the lower end of the upper deck plate 10A and the upper end of the lower deck plate 10B are arranged at substantially the same position in the vertical direction. However, the extent to which the upper deck plate 10A and the lower deck plate 10B are vertically shifted is not particularly limited, and they may overlap each other in the vertical direction.

Note that another upper deck plate 10A is arranged at a position adjacent to the upper deck plate 10A on the upper slab side in the span direction D1. Further, another lower deck plate 10B is arranged at a position adjacent to the lower deck plate 10B on the lower slab side in the span direction D1. The portions where the pair of upper deck plates 10A face each other are supported from below by beam members 11A. The portions where the pair of lower deck plates 10B face each other are supported from below by beam members 11B. The beam members 11A and 11B are steel members with an H-shaped cross section extending in the width direction D2. Note that since the upper deck plate 10A is arranged at a higher position than the lower deck plate 10B, the beam 11A extends above the beam 11B. Note that no beam material is provided between the upper deck plate 10A and the lower deck plate 10B, that is, at the position of the step 16 on the lower surface side.

Concrete 12 is placed on the upper surface sides of the upper deck plate 10A and the lower deck plate 10B. The concrete 12 is filled into the groove portions 10d of the upper deck plates 10A and 10B to a level higher than the top surface of the peak portion 10c. The concrete 12 has a planar upper surface 13A extending in the horizontal direction at a position spaced apart by a predetermined distance upward from the peak portion 10c of the upper deck plate 10A. The concrete 12 has a planar lower surface 13B that extends in the horizontal direction at a position spaced apart by a predetermined distance upward from the peak portion 10c of the lower deck plate 10B. Moreover, the concrete 12 has a stepped surface 13C that extends in the width direction D2 while extending in the vertical direction between the upper step surface 13A and the lower step surface 13B. The step surface 13C is arranged at a position spaced from the end 10n of the upper deck plate 10A toward the lower slab side.

In this way, a step 15 is formed on the upper surface side of the composite slab structure 100 by the upper step surface 13A, the lower step surface 13B, and the step surface 13C. Further, due to the arrangement of the upper deck plate 10A and the lower deck plate 10B as described above, a step 16 is also formed on the lower surface side of the composite slab structure 100. Specifically, the lower surface of the upper deck plate 10A forms an upper surface 14A on the lower surface side that extends in the horizontal direction. The lower surface of the lower deck plate 10B forms a lower surface 14B on the lower surface side that extends in the horizontal direction. Further, a step surface 14C on the lower surface side that extends in the width direction D2 while extending in the vertical direction is formed between the upper step surface 14A and the lower step surface 14B on the lower surface side. Note that the end portion 10h of the lower deck plate 10B is sealed with a mold member (not shown) to prevent the concrete 12 from leaking during pouring. Therefore, the step surface 14C on the lower surface side is constituted by the mold member. As a result, a step 16 is formed on the lower surface side of the composite slab structure 100 by the upper step surface 14A, the lower step surface 14B, and the step surface 14C.

With the above configuration, the composite slab structure 100 includes an upper slab 60A, a lower slab 60B, and an overlapping portion 60C where the upper slab 60A and the lower slab 60B overlap. The slab upper stage 60A is formed at a position where the upper stage surface 13A on the upper surface side and the upper stage surface 14A on the lower surface side overlap. The slab lower stage 60B is formed at a position where the lower stage surface 13B on the upper surface side and the lower stage surface 14B on the lower surface side overlap. The overlapping portion 60C is formed at a position where the upper stage surface 13A on the upper surface side and the lower stage surface 14B on the lower surface side overlap. Therefore, the upper deck plate 10A becomes a member disposed on the upper slab 60A side. The lower deck plate 10B is a member placed on the lower slab 60B side. In this embodiment, the thickness of the upper slab 60A and the lower slab 60B are set to be substantially the same, but the relationship between the thicknesses is not particularly limited, and different thicknesses may be set.

Next, with reference to FIG. 3, the structure near the steps 15 and 16 of the composite slab structure 100 will be described in detail. FIG. 3 is an enlarged cross-sectional view showing the structure near the steps 15 and 16 of the composite slab structure 100. In addition, since the thickness of the deck plates 10A and 10B is very thin when viewed from the entire synthetic slab structure 100, the thickness of the cross section of the deck plates 10A and 10B is described as a simple straight line.

As shown in FIG. 3, a first stress transmission member 20 and a second stress transmission member 25 are provided in the concrete 12 to transmit stress between the upper slab 60A and the lower slab 60B. Further, the stress transmission member 20 includes a first portion 21 and a second portion 22. The first stress transmission member 20 may be composed of a single reinforcing bar. In this case, the corresponding locations in one reinforcing bar are the first portion 21 and the second portion 22.

The first portion of the first stress transmission member 20A is a portion extending in the span direction D1 within the groove portion 10d of the upper deck plate 10A. Further, the second portion 22 is a portion that extends toward the lower slab 60B side from the end portion 10n of the upper deck plate 10A and is disposed above the lower deck plate 10B.

Specifically, the first portion 21 is arranged between the top surface of the peak portion 10c of the upper deck plate 10A and the bottom surface of the groove portion 10d in the vertical direction. Further, the first portion 21 extends linearly in parallel to the span direction D1 in an internal region surrounded by the bottom surface and both side surfaces of the groove portion 10d (see FIG. 2). The length of the first portion 21 in the span direction D1 within the groove portion 10d is not particularly limited as long as the desired stress transmission performance can be exhibited, but it is set to be larger than at least the height of the upper deck plate 10A and the width of the groove portion 10d. ing. For example, the length of the first portion 21 in the span direction D1 within the groove portion 10d may be set to about 400 to 640 mm. Further, the end of the first portion 21 on the lower slab 60B side is connected to the second portion 22 at the end 10n of the upper deck plate 10A.

The second portion 22 of the first stress transmitting member 20 extends closer to the slab lower step 60B than the stepped surface 13C. The second portion 22 protrudes from the end 10n of the upper deck plate 10A, passes through the overlapped portion 60C, and extends to a position reaching the lower slab 60B. The second portion 22 extends linearly in parallel to the span direction D1 so that the first portion 21 extends in the same manner as it is. The length of the second portion 22 in the span direction D1 within the concrete 12 is not particularly limited as long as it can exhibit the desired stress transmission performance, but may be set to about 400 to 640 mm, for example. The height position of the second portion 22 is the same as that of the first portion 21. The second portion 22 is set at a position higher than at least the upper surface of the peak portion 10c of the lower deck plate 10B and lower than the lower surface 13B. Note that if the step is small and the deck plates 10A and 10B overlap in the height direction, the second portion 22 may be lower than the upper surface of the peak portion 10c.

The second stress transmission member 25 is a portion extending in the span direction D1 within the groove portion 10d of the lower deck plate 10B. The second stress transmission member 25 may be composed of a single reinforcing bar. The second stress transmitting member 25 is arranged between the top surface of the peak portion 10c of the lower deck plate 10B and the bottom surface of the groove portion 10d in the vertical direction. Further, the second stress transmitting member 25 extends linearly in parallel to the span direction D1 in an internal region (see FIG. 2) surrounded by the bottom surface and both side surfaces of the groove portion 10d. The end of the second stress transmitting member 25 on the slab upper stage 60A side is arranged at a position slightly spaced from the step surface 14C on the lower surface side toward the slab lower stage 60B side. The end of the second stress transmission member 25 on the slab upper stage 60A side is arranged at a position closer to the slab upper stage 60A in at least the overlapping portion 60C.

The second stress transmission member 25 passes through the overlapping portion 60C, extends inside the slab lower stage 60B, and extends to a position closer to the slab lower stage 60B than the first stress transmission member 20. The length of the second stress transmission member 25 in the span direction D1 within the groove 10d is not particularly limited as long as it can exhibit the desired stress transmission performance, but it is at least larger than the height of the lower deck plate 10B and the width of the groove 10d. It is set. For example, the length of the second stress transmitting member 25 in the span direction D1 within the groove portion 10d may be set to about 770 to 1010 mm.

Although the position of the first stress transmitting member 20 in the width direction D2 with respect to the groove portion 10d is not particularly limited, for example, as shown in FIG. 2, it may be arranged at the center position in the width direction D2 in the groove portion 10d. However, the first stress transmission member 20 may be arranged at a position closer to either side in the width direction D2 with respect to the groove portion 10d. Corresponding to this, the second stress transmission member 25 may be arranged at the same position as the first stress transmission member 20 in the width direction D2. In this case, the first stress transmission member 20 and the second stress transmission member 25 are arranged so as to overlap each other when viewed from the vertical direction. However, the first stress transmission member 20 and the second stress transmission member 25 may be arranged so as to be shifted from each other when viewed from the top and bottom.

At least one stress transmission member 20, 25 is arranged in each of the plurality of grooves 10d of the upper deck plate 10A and the lower deck plate 10B. Specifically, as shown in FIG. 2, the stress transmission members 20 and 25 are arranged in one groove 10d, and also in a groove 10d adjacent to the groove 10d in the width direction D2. In this way, the stress transmitting members 20 and 25 are arranged in all the grooves 10d of the deck plates 10A and 10B. Note that the stress transmitting members 20, 25 are arranged in all the grooves 10d in some regions in the width direction D2, and in some other regions, there are grooves 10d in which the stress transmitting members 20, 25 are not arranged. Good too.

Next, the functions and effects of the composite slab structure 100 according to this embodiment will be explained.

In the composite slab structure 100 according to the present embodiment, the lower deck plate 10B on the lower slab 60B side is arranged below the upper deck plate 10A on the upper slab 60A side. According to such a configuration, unlike a configuration in which a step is created by pouring concrete so that the thickness of the upper slab becomes thicker with respect to a straight deck plate, the thickness of the upper slab 60A and the lower slab are different. The difference with the thickness of 60B can be eliminated or reduced. Therefore, an increase in weight due to excessively increasing the thickness of the upper slab 60A can be suppressed. Here, a first stress transmission member 20 is provided in the concrete 12 to transmit stress between the upper slab 60A and the lower slab 60B. This first stress transmission member 20 includes a first portion 21 extending in the span direction D1 within the groove 10d of the upper deck plate 10A, and a first portion 21 extending toward the lower slab 60B side from the end 10n of the upper deck plate 10A, and a second portion 22 disposed above the plate 10B. Since the first portion 21 is disposed within the groove 10d of the upper deck plate 10A, by adhering to the concrete 12, it can sufficiently receive the stress acting on the upper deck plate 10A. The second portion 22 extends toward the lower slab 60B side and is arranged above the lower deck plate 10B. Therefore, the first stress transmitting member 20 can effectively transmit stress between the first portion 21 and the second portion 22. As described above, even if the upper deck plate 10A and the lower deck plate 10B are separated without being connected via a beam or the like, stress can be transmitted well through the first stress transmitting member 20. It can be performed. In addition, since the first stress transmission member 20 only needs to be a member of a predetermined shape placed in the concrete 12, the structure is simpler than when stress is transmitted using beams or the like. This can reduce the amount of time required for construction. In particular, in this embodiment, since the first stress transmission member 20 is a single straight reinforcing bar, there is no need for bending or the like, so construction is very easy. As described above, the step 15 can be provided without complicating the structure.

The concrete 12 has an upper surface 13A, a lower surface 13B, and a stepped surface 13C between the upper surface 13A and the lower surface 13B, and the stepped surface 13C extends from the end 10n of the upper deck plate 10A to the lower slab The second portion 22 of the first stress transmitting member 20 extends to the lower slab 60B side from the stepped surface 13C. In this case, the first stress transmission member 20 is inserted to a deep position into the concrete 12 above the lower deck plate 10B. Thereby, the adhesion of the first stress transmission member 20 to the concrete 12 above the lower deck plate 10B can be improved.

A second stress transmitting member 25 may be provided within the concrete 12 and extending in the span direction D1 within the groove portion 10d of the lower deck plate 10B. Since the second stress transmitting member 25 is disposed within the groove portion 10d of the lower deck plate 10B, by adhering to the concrete 12, it becomes possible to sufficiently receive the stress acting on the lower deck plate 10B. The second stress transmitting member 25 can easily transmit stress via the concrete 12 to the second portion 22 of the first stress transmitting member 20 located above. Thereby, stress can be favorably transmitted between the upper deck plate 10A and the lower deck plate 10B via the first stress transmitting member 20 and the second stress transmitting member 25.

At least one stress transmission member 20, 25 may be arranged in each of the plurality of grooves 10d of the upper deck plate 10A and the lower deck plate 10B. Thereby, stress can be transmitted well at each position in the width direction D2 of the upper deck plate 10A and the lower deck plate 10B.

The invention is not limited to the embodiments described above.

For example, the structure shown in FIG. 4 may be adopted. The composite slab structure 100 shown in FIG. 4 differs from the structure shown in FIG. 3 mainly in that a reinforcing member 30 is provided.

As shown in FIG. 4, a reinforcing member 30 extending in the vertical direction may be provided in the concrete 12 at the boundary (overlapping portion 60C) between the upper deck plate 10A and the lower deck plate 10B. The reinforcing member 30 is a member for suppressing cracking of the concrete 12 at the boundary portion. The reinforcing member 30 has a substantially Z-shape and includes a rising portion 31, an upper portion 32, and a lower portion 33. The reinforcing member 30 may be composed of a single reinforcing bar. In this case, the rising portion 31, the upper step portion 32, and the lower step portion 33 are formed by bending one reinforcing bar.

The rising portion 31 is a portion that extends linearly in the vertical direction in the overlapping portion 60C. The rising portion 31 rises at a position close to the end 10h of the lower deck plate 10B and the end 10n of the upper deck plate 10A, along the ends 10h, 10n. The lower end of the rising portion 31 is disposed within the groove portion 10d of the lower deck plate 10B.

The rising portion 31 extends to a position higher than the upper deck plate 10A. That is, the rising portion 31 extends to a position higher than the upper surface of the peak portion 10c of the upper deck plate 10A and close to the upper surface 13A. Here, it is preferable that the rising portion 31 extends above the neutral axis of the upper slab 60A. When considering the deformation of the composite slab structure 100, the region above the neutral axis of the upper slab 60A corresponds to a compression region. Therefore, the adhesion of the reinforcing member 30 to the concrete 12 can be improved by disposing the rising portion 31 (and the upper stage portion 32 described below) in the compression region.

The upper stage portion 32 is a portion extending from the upper end of the rising portion 31 toward the slab upper stage 60A side. The upper section 32 is arranged at a higher position than the upper deck plate 10A. That is, the upper portion 32 is located at a position higher than the upper surface of the peak portion 10c of the upper deck plate 10A and close to the upper surface 13A. The upper section 32 extends linearly parallel to the span direction D1. The length of the upper section 32 is not particularly limited as long as it can improve adhesion to the concrete 12, but it is set to be larger than at least the height of the upper deck plate 10A and the width of the groove section 10d, and the length of the upper section 32 is set to be larger than the height of the upper deck plate 10A and the width of the groove section 10d. It extends to.

The lower step portion 33 is a portion extending from the lower end of the rising portion 31 toward the slab lower step 60B side. The lower portion 33 is arranged within the groove portion 10d of the lower deck plate 10B. The lower step portion 33 extends linearly in the groove portion 10d parallel to the span direction D1. The length of the lower section 33 is not particularly limited as long as it can improve adhesion to the concrete 12, but is set to be larger than at least the height of the upper deck plate 10A and the width of the groove section 10d. Note that, although the lower section 33 extends from the overlapping section 60C to the lower slab section 60B, it may not extend to the lower slab section 60B.

In FIG. 4, the reinforcing member 30 is arranged on the front side of the paper in the width direction D2 with respect to the stress transmission members 20 and 25, but it may be arranged on the back side of the paper. Further, at least one stress transmitting member 20, 25 was disposed for each of the plurality of grooves 10d of the upper deck plate 10A and the lower deck plate 10B, but the reinforcing member 30 was similarly arranged for each of the plurality of grooves 10d. may be arranged for each. However, the number of reinforcing members 30 may be smaller than the stress transmitting members 20 and 25, and may be arranged at a ratio of one to two grooves 10d or one to three or more grooves 10d. good.

In the structure shown in FIG. 4, the reinforcing member 30 can restrain the concrete 12 in the vertical direction at the boundary between the upper deck plate 10A and the lower deck plate 10B. Therefore, the reinforcing member 30 can suppress cracks in the concrete 12 near the stress transmitting members 20 and 25 that develop from the end of the upper deck plate 10A. Thereby, it is possible to suppress a decrease in the adhesion force between the stress transmission members 20 and 25 and the concrete 12, and to ensure the stress transmission performance of the stress transmission members 20 and 25.

The reinforcing member 30 may extend to a position higher than at least the upper deck plate 10A. In this case, the reinforcing member 30 can sufficiently restrain the concrete 12.

Further, the structure shown in FIG. 5 may be adopted. The composite slab structure 100 shown in FIG. 5 differs from the structure shown in FIG. 4 mainly in that a reinforcing member 40 having a different shape from the reinforcing member 30 is provided.

The reinforcing member 40 has a substantially square shape and includes rising portions 41 and 44, an upper portion 42, and a lower portion 43. The reinforcing member 40 may be configured as a stirrup by forming the approximately square-shaped shape with a single reinforcing bar, and arranging a plurality of the square-shaped members in the width direction D2 and connecting them to each other with connection bars 45. . In this case, the substantially rectangular shape is formed by bending one reinforcing bar to form rising parts 41, 44, an upper stage part 42, and a lower stage part 43. The reinforcing member 40 is arranged so as to fit within the overlapped portion 60C. In addition, the position of each part can be changed as appropriate within a range that can ensure the adhesion of the reinforcing member 40 to the concrete 12.

The rising portion 41 has substantially the same configuration as the rising portion 31 in FIG. 4 . The rising portion 44 is a portion that extends linearly in the vertical direction near the stepped surface 13C within the overlapping portion 60C.

The upper stage part 42 extends linearly between the upper end of the rising part 41 and the upper end of the rising part 44 along the upper stage surface 13A parallel to the span direction D1. The lower portion 43 extends linearly between the lower end of the rising portion 31 and the lower end of the rising portion 44 in the groove portion 10d of the lower deck plate 10B, parallel to the span direction D1.

In the structure shown in FIG. 5, the reinforcing member 40 can restrain the concrete 12 in the vertical direction and the horizontal direction (span direction) at the boundary between the upper deck plate 10A and the lower deck plate 10B. . Therefore, the reinforcing member 40 can suppress cracks in the concrete 12 near the stress transmitting members 20 and 25 that develop from the end of the upper deck plate 10A. Thereby, it is possible to suppress a decrease in the adhesion force between the stress transmission members 20 and 25 and the concrete 12, and to ensure the stress transmission performance of the stress transmission members 20 and 25. In particular, since the reinforcing member 40 can restrain the concrete 12 in the overlapped portion 60C over a wide range, cracks can be suppressed well.

The reinforcing member 40 may extend to a position higher than at least the upper deck plate 10A. In this case, the reinforcing member 40 can sufficiently restrain the concrete 12.

Note that the shape of the reinforcing member is not limited to that shown in FIGS. 4 and 5, and various other shapes such as an L-shape or a U-shape may be adopted.

Further, in the above-described embodiment, the stress transmission members 20 and 25 were made up of a single reinforcing bar, but there is no particular limitation on what kind of member the stress transmission members 20 and 25 are made of. For example, a plurality of reinforcing bars may be connected in the span direction D1. Moreover, the stress transmission members 20 and 25 may be constructed by bundling a plurality of reinforcing bars, or may be constructed from a plate material, a wire mesh, or a fiber.

The number of stress transmitting members 20, 25 is not particularly limited either, and they may be arranged at a ratio of one to two grooves 10d, or one to three or more grooves 10d. Alternatively, a plurality of stress transmission members 20 and 25 may be arranged for one groove 10d.

Here, since the stress transmitting members 20 and 25 may be placed in the grooves of the deck plate that is integrated with the concrete, the cross-sectional shape of the deck plate is not particularly limited. For example, a deck plate as shown in FIG. 6 may be employed. In the deck plates 110A and 110B shown in FIG. 6A, the grooves 112 are formed deeper because the peaks 111 are higher than in the deck plates 10A and 10B shown in FIG. In the deck plates 120A and 120B shown in FIG. 6(b), the groove portions 122 are formed to be small because the peak portions 121 are formed wide in the width direction. Deck plates 130A and 130B shown in FIG. 6(c) are deck plates called Cynos decks, in which a mountain portion 131 is formed in a substantially plate shape, and a groove portion 132 is wide.

Further, in the embodiment described above, both the first stress transmission member 20 and the second stress transmission member 25 were provided, but the second stress transmission member 25 may be omitted.

The lengths and shapes of the stress transmitting members 20 and 25 are not particularly limited, and may be changed as appropriate within the spirit of the present invention. For example, the stress transmission members 20 and 25 may be bent at arbitrary positions.

10A, 110A, 120A, 130A... Upper deck plate, 10B, 110B, 120B, 130B... Lower deck plate, 10d, 112, 122, 132... Groove, 12... Concrete, 13A... Upper surface, 13B... Lower surface, 13C... Step surface, 60A... Slab upper stage, 60B... Slab lower stage, 15... Step, 20... First stress transmission member, 21... First part, 22... Second part, 25... Second stress transmission member, 30 , 40... Reinforcement member.

Claims (5)

A synthetic slab structure with steps,
an upper deck plate disposed on the upper side of the slab and having a plurality of grooves extending in the span direction;
a lower deck plate disposed on the lower side of the slab and having a plurality of grooves extending in the span direction;
Concrete forming the upper slab and forming the lower slab,
The upper deck plate and the lower deck plate are arranged in the span direction,
The lower deck plate is arranged below the upper deck plate,
A first stress transmission member that transmits stress between the upper slab and the lower slab is provided in the concrete,
The first stress transmission member is
a first portion extending in the span direction at a position spaced upward from the bottom surface of the groove within the groove of the upper deck plate;
a second portion extending toward the lower side of the slab from the end of the upper deck plate and disposed above the lower deck plate ;
A second stress transmission member extending in the span direction is provided in the concrete at a position spaced upward from the bottom surface of the groove in the groove of the lower deck plate,
The second stress transmission member is configured as a separate member from the first stress transmission member,
In the composite slab structure , an end of the second stress transmission member on the slab upper stage side extends in the span direction without bending upward . The concrete has an upper step surface, a lower step surface, and a step surface between the upper step surface and the lower step surface,
The step surface is arranged at a position spaced from the end of the upper deck plate toward the lower side of the slab,
2. The composite slab structure according to claim 1, wherein the second portion of the first stress transmission member extends to a lower step side of the slab than the stepped surface. 3. The composite slab structure according to claim 1 , wherein a reinforcing member extending in the vertical direction is provided in the concrete at a boundary between the upper deck plate and the lower deck plate. 4. The composite slab structure of claim 3 , wherein the reinforcing member extends to a position higher than at least the upper deck plate. The composite slab structure according to any one of claims 1 to 4 , wherein at least one of the first stress transmission members is arranged in each of the plurality of grooves of the upper deck plate and the lower deck plate. .

Images